Telescopic girder for shuttering work



Sept. 6, 1960 o. G. MEYER TELEscoPIc GIRDER FOR SHUTTERING WORK Filed May 3l, 1957 //V I/f/W'O 0770 Gun/T52 MEYER.

mw mv MN mm m mv NN NN United States Patent O TELESCOPIC .GIRDER FOR SHU'ITERING WORK Otto 'Gunter-Meyer, 8A Speerstrasse, Peine, Niedersachsen, `Germany Filed AMay '31, 1957, Ser, No. 662,875

claims. (ci. iss-31) This invention relates to a telescopic girder`V compris ing twoor more girders arranged 4to' be telescoped one into the other. i.

It is known to arrange girders in telescopic relation whereby several girders are placed one into the other so that they may be continuously adjusted in length over a certain distance.

The primary object of this invention is to provide a telescopic girder construction with a means for firmly locking the girders in adjusted position which can be readily locked and unlocked.

Another object of this invention is to provide a lock for telescopic girders which may be locked and unlocked over a long period of time without becoming defective because of wear, etc.

A further object is to provide such a lock which may be very quickly locked and unlocked with the use of a tool or tools which are readily available on a construction site.

The foregoing objects and others ancillary thereto are accomplished according to a preferred embodiment of -the invention, wherein the outer girder of the telescopic girder construction is provided on its lower surface with a locking device which includes two spaced members depending from the outer girder. A pressure element is disposed between said members and its upper surface engages the inner girder. A wedge is disposed through the spaced members and is movable to urge the pressure element upwardly which forces the inner girder into frictional contact with the outer girder.

According to the invention the lower belt of the outer girder is at its ends bent downwards near one end thereof, and a further ilat steel bar which extends parallel to the downwardly bent end is welded adjacent the end of the lower belt to lateral bracings. This ilat steel bar and also the downwardly bent end of the lower belt are provided with slots to receive a wedge having a relatively flat wedge face. Between both, a pressure receiving element is arranged which also is provided with a slot It may be pressed against the lower belt of the inner girder by means of the wedge. The arrangement of the downwardly bent end of the lower belt constitutes an especially simple and advantageous support to receive the connection by means of the Wedge. The ends or one end of the outer girder and always one end of the inner girder are provided in known manner with claws which are level with the upper girder and which are used to place the ends of the girder upon supporting walls and the like.

The invention will now be described with reference to the accompanying drawings which show one form of embodirnent.

Fig. 1 shows a side elevation of the girder according to the invention,

Fig. 2 shows a section through the line II-II of Fig. l,

Fig. 3 shows a section through the girder along the line III-III f Fig. 1, and

girder along the ice 2 Fig. 4 `shows on Aan enlarged scale the arrangement of the wedge connection according tothe invention.

Into the outer girder 41 the inner girder 2 is placed. The upperybelt' 3 of the outer girder 1 is constituted by an'lupper member having an'inverted U-shaped crosssection, 'the lower belt 4 by atrectangular rolled profile. Each shank 5 and 5 of the upper belt is connected to the lower belt- 4 through a zigzag shaped profile iron 6 preferably a round lbar or oval bar iron whereby the `ends of each peak are Welded at the point 7 i tothe lower belt 4 or the upperbelt 3. The crosssection ofthe outer girder may have a'substantially Vtriangular form, whereby the sideward'shanks are constituted by the proile iron 6 or theshanks 8 andS of theupper belt 3 ofthe upper belt and whereby fthe third side is constituted by the side 9 of thev upperbelt interconnecting thevshanks 8, 8'. i i

The inner girder 2 may be constructed of triangular cross section with complete walls and formed from sheet metal by bending. The external dimensions of the inner girder cross section are smaller than the interior dimensions of the outer girder cross section. The one side wall of the triangular profile of the inner girder forms the upper belt 10 and the two Shanks l11, 11 of the triangular prole are welded with their ends to the lower belt 112 which is of rectangular shape whereby the closed box is obtained.

The profiles of the inner and outer girder have a great resistance against torsion owing to their triangular closed construction. The outer girder has a. low weight owing lto the braced construction of its side walls. The inner girder, however, is formed as a girder with complete side walls so that its lower belt may take up the load from the bracing connection at any desired place. The bracing connection or locking means is described below.

The upper belt 3 is longer than the lower belt 4 so that its ends project beyond the ends of the lower belt. The end 13 of the upper belt is connected by means of braces V14 and 14 to the last connection point of the zigzag connection of the lower belt. The end 15 of the lower belt 4 of the outer girder is vertically bent downwardly and has an aperture 16. A at iron 17 is welded parallel to the end 15 of the lower belt between the braces 14 and 14 and is also provided with an aperture 16. A pressure exerting element 18 with `an aperture 19 is displaceably arranged in Vertical direction and guided between the end 15 and the hat steel bar 17. A wedge 20 is pushed through the apertures .16', 19 and 16 and rests upon the lower surfaces of the apertures 16, 16. When the wedge 20 is driven in, the element 18 is lifted and pressed against the lower belt 12 of the inner girder so that it bears against the inner surface of the upper belt 3 of the outer girder 1, whereby a rigid connection between the inner girder and the outer girder is obtained.

The wedge 20 has a relatively small pitch so that it is once self-hemming and on the other hand allows a slow yielding of the bracing if the connection is loosened when the girder is under load.

To the end Z1 of the upper belt of the outer girder 1 and to the end 212 of the inner girder 2 claws 23 or 23 are welded in known manner which are used to place the ends of the girder upon supporting walls or other supports. At the front faces of the inner girder reinforcing profiles 24, 24 are provided between upper and lower belts whereby the reinforcing profile 24' is in connection with the claw 23'.

-What I claim is:

1. A telescopic girder construction comprising an outer girder and an inner girder partially positioned therein and both having reenforced portions on one side and frictional engaging surfaces Von the side opposite said portions, the inner girder being of smaller cross-sectional dimensions than said outer girder to permit free sliding movement between said girders and said surfaces, and wedge lock means connecting said reenforced portions at a station below said girders and including two spaced members depending from the reenforced portion of the outer girder, a pressure element disposed intermediate said members and abutting against the reenforced portion of said inner girder, and pressure exerting means between said members and said element to urge the latter and thus the reenforced portion and the frictional surface of the inner girder toward the frictional surface of the outer girder.

2. A telescopic girder yaccording to claim l wherein 15 said pressure ekerting means comprises a wedge, said depending Vmembers having aligned apertures and said p ressure element having an aperture generally alignable with said member apertures, said Wedge extending through al1 ofsaid apertures, e I

3. A telescopic girder according to claim 2 `wherein one of said depending members is formed by a bent portion of the reenforced portion of the outer girder and the other being formed by a plate welded to the outer girder, and said wedge having a vertical taper.

References Cited in the le of this patent UNITED STATES PATENTS 607,787 Berg July 19, 1898 2,711,806 Smith June 28, 1955 FOREIGN PATENTS A 405,279 Great Britain Jan. 29, 1934 1,098,051 France Mar. 2, 1955 735,956 Great Britain Aug. 31, 1955 739,057 Great Britain Oct. 26, 1955 OTHER REFERENCES Weinert: German application, Serial No. B26967,

prin-ted September 1, 1955 (Kl. 5C9).

Heilwagen: German application, Serial No. H14291, February 2, 1956 (Kl. 37e10). 

